In preparation for JEP 260, and as per the suggestion over on the core libs[1], sun.misc.PerformanceLogger should be moved to sun.util.logging.
http://cr.openjdk.java.net/~chegar/8146735/ -Chris [1] http://mail.openjdk.java.net/pipermail/core-libs-dev/2016-January/037959.html
